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- Star_quad_cable abstract "Star-quad cable provides magnetic immunity when used in a balanced line. Four conductors are used to carry the two legs of the balanced line. All four conductors must be an equal distance from a common point (usually the center of a cable). The four conductors are arranged in a four-pointed star (forming a square). Opposite points of the star are connected together at each end of the cable to form each leg of the balanced circuit. All points of the star lie at equal distances from the center of the star. When opposite points are connected together they act as if they are one conductor located at the center of the star. This configuration places the geometric center of each of the two legs of the balanced circuit in the center of the star. To a magnetic field, both legs of the balanced circuit appear to be in the exact center of the star. This means that both legs of the balanced circuit will receive exactly the same interference from the magnetic field and a common-mode interference signal will be produced. This common-mode interference signal will be rejected by the balanced receiver. The magnetic immunity of star quad cable is a function of the accuracy of the star-quad geometry, the accuracy of the impedance balancing, and the common-mode rejection ratio of the balanced receiver. Star-quad cable typically provides a 10 dB to 30 dB reduction in magnetically-induced interference. Star-quad cable can be used for two circuits, such as 4-wire telephony and other telecommunications applications, but it will not provide magnetic immunity in this application. In this configuration each pair uses two non-adjacent conductors. Because the conductors are always the same distance from each other, crosstalk is reduced relative to cables with two separate twisted pairs. Each conductor of one pair sees an equal capacitance to both wires in the other pair. This cancels the capacitive crosstalk between the two pairs. The geometry also cancels the magnetic interference between the two pairs.When star-quad cable is used for a single balanced line, such as professional audio applications and 2-wire telephony, two non-adjacent conductors are terminated together at both ends of the cable, and the other two conductors are also terminated together. Interference picked up by the cable arrives as a virtually perfect common mode signal, which is easily removed by a coupling transformer or differential amplifier.The combined benefits of twisting, differential signalling, and quadrupole pattern give outstanding noise immunity, especially advantageous for low signal level applications such as long microphone cables, even when installed very close to a power cable. The disadvantage is that star quad, in combining two conductors, typically has double the capacitance of similar two-conductor twisted and shielded audio cable. High capacitance causes an increasing loss of high frequencies as distance increases. The high-frequency loss is due to the RC filter formed by the output impedance of the cable driver and the capacitance of the cable. In some cases, cable capacitance can also cause an increase in distortion due to the dielectric absorption of certain insulating materials.".
- Star_quad_cable thumbnail Star_quad.svg?width=300.
- Star_quad_cable wikiPageID "49451315".
- Star_quad_cable wikiPageLength "4959".
- Star_quad_cable wikiPageOutDegree "15".
- Star_quad_cable wikiPageRevisionID "705469890".
- Star_quad_cable wikiPageWikiLink Balanced_line.
- Star_quad_cable wikiPageWikiLink Category:Electronics.
- Star_quad_cable wikiPageWikiLink Common-mode_interference.
- Star_quad_cable wikiPageWikiLink Dielectric_absorption.
- Star_quad_cable wikiPageWikiLink Differential_amplifier.
- Star_quad_cable wikiPageWikiLink File:Star_quad.svg.
- Star_quad_cable wikiPageWikiLink Four-wire_circuit.
- Star_quad_cable wikiPageWikiLink Professional_audio.
- Star_quad_cable wikiPageWikiLink RC_circuit.
- Star_quad_cable wikiPageWikiLink Two-wire_circuit.
- Star_quad_cable wikiPageWikiLink File:Star-Quad_Cable_Cross_Section.jpg.
- Star_quad_cable wikiPageWikiLink File:Star-Quad_Simple.jpg.
- Star_quad_cable wikiPageWikiLink File:Star-Quad_exploded.jpg.
- Star_quad_cable wikiPageWikiLinkText "star quad cable".
- Star_quad_cable wikiPageWikiLinkText "star quad".
- Star_quad_cable wikiPageUsesTemplate Template:Reflist.
- Star_quad_cable subject Category:Electronics.
- Star_quad_cable comment "Star-quad cable provides magnetic immunity when used in a balanced line. Four conductors are used to carry the two legs of the balanced line. All four conductors must be an equal distance from a common point (usually the center of a cable). The four conductors are arranged in a four-pointed star (forming a square). Opposite points of the star are connected together at each end of the cable to form each leg of the balanced circuit.".
- Star_quad_cable label "Star quad cable".
- Star_quad_cable wasDerivedFrom Star_quad_cable?oldid=705469890.
- Star_quad_cable depiction Star_quad.svg.
- Star_quad_cable isPrimaryTopicOf Star_quad_cable.